If the style of the artwork looks familiar to you, it might be that you've read the Amulet series. The illustrator of the new covers is Kazu Kibushi, whose work appears in all of the Amulet graphic novels.
Kibushi at first turned down the offer to illustrate the new covers. He told Scholastic, "When I was asked to submit samples, I initially hesitated because I didn't want to see them reinterpreted! However, I felt that if I were to handle the project, I could bring something to it that many other designers and illustrators probably couldn't, and that was that I was also a writer of my own series of middle grade fiction." He also said that he wanted the new covers to look as though they could stand the test of time.
So, what do you think? You can vote on the new cover art in the poll at the right side of this page. Also, check back to see the new covers as they are revealed.